2013年11月7日 星期四

APC Management Card can't access WebGUI (Someone is currently logged into the APC Management Web Server.)

If you have APC Management Interface Card, you will always happen the following problem, you must use previous machine & ip address to login and logout, else you will never get in the web interface, because it seem never have timeout on login session.








You have three solution to solve it :

Solution 1:
just simple access the following website to logout the previous session.
http://<apc management card ip>/logout.htm

Solution 2:
using telnet access the APC management card, reboot the Management card.
3. System > 4. Tools > 1. Reboot
Solution 3 :
Using a clip to press reset hole on APC mangement card

2013年10月9日 星期三

Appliance / Firewall / Router Reset and Default Username & Password

How to connect wireless network

EnGenius ESR350 Wireless N300 Cloud Router
Reset
For resetting the router to its factory default settings by pressing button for more than 11 seconds or until the Power LED starts flashing.
Default Setting
Username : admin
Password : admin
IP Address : 192.168.0.1

[Official Web]


EnGenius EAP350 Access Point
Reset
Press and hold the “Reset” button over 10 seconds to reset EAP350 to factory default. 
Default Setting
Username : admin
Password : admin
IP Address : 192.168.1.1



TP-Link WR702N Portable Wi-Fi
Reset
Press and hold the “Reset” button over 5 seconds to reset factory default. 
Default Setting
Username : admin
Password : admin
IP Address : 192.168.0.254



DrayTek VIGOR 2930n <<< DrayTek All Series & Model does not support Range Port Forwarding >>>
Reset
you can instead press the reset button the the back of the router and hold it until the left-hand LED starts to flicker rapidly, then release the button. Wait for the router LEDs to settle and the ACT LED to flash normally again
Default Setting
Username : admin or <blank>
Password : <blank>
IP Address : 192.168.1.1:80

2013年8月27日 星期二

關於 PoE 及 Injector/Splitter 的分別



PoE 全名Power Over Ethernet, 即平時我們使用的Network Cable (CAT5e) 除資料傳輸外還提供電力供應

一個完整的PoE Network, 本身應該有一隻PoE Switch這樣便可著有一條Lan線直接接駁到包含有PoE功能 Wi-Fi AP, IP Cam 或SIP Phone上, 好處在於以往安裝Wi-Fi AP時由於AP需罷放一個合適的地方以Cover整個位置, 但由於這個所謂合適的地方往往是沒有電源插蘇, 需要額外安裝電源插蘇或拉多一條電源線相當麻煩

PoE 的好處
1. 著由一隻PoE Switch可管理好多隻 PoE 的裝置
2. 如有UPS提供電源給PoE Switch相等如UPS提供了所有PoE設備的電力保障
3. 謀些程狀底下容易Reset電源, 如IP Cam或AP 安裝在天花板上或不容易接觸的地方, 需要reset電源時, 其實只需在PoE Switch上plug and unplug便可

使用PoE Switch時亦需注意PoE Switch的電源輸出是否足夠PoE設備所使用, PoE Switch的價錢亦不便宜!




PoE Injector
 - PoE Injector可參照下圖, 把沒有提供電力的CAT5線接駁後, 再轉換為PoE, 主要用途是當你沒有PoE Switch但同時需要連接到 PoE Device
(注意有些Wi-Fi Router如 TP-Link隨router本身會附有 PoE Injector, 這個Injector不可使用在其他品牌的設備上, 好大機會出現電壓問題而損壞)

PoE Splitter
 - PoE Splitter 可參照下圖, 主要是把PoE連接到你的非PoE Device


2013年8月19日 星期一

奠儀 及 禮金傳統上寫法應如何書寫


Apple Mac OS X Hotkey and BootCamp

HotKey

Reset PRRAM
 - Turn On Mac
 - Press 4 Key and Hold (Option)+(Command)+(R)+(P)
 - Wait Restart 3 times and boot sound
 - Release Hold Key

Boot Internet Recovery  (Recovery / Reinstall Mac OS)
 - Hold (Option)+(Command)+(R) around 20-30 sec, waiting screen come out.
 - You can connect to Wi-Fi and download Recovery from Internet
 - You can dump harddisk data to Image store to your external harddisk
 - You can get the OS from internet and install again

Boot Menu (Boot from USB, CDROM or Other)
 - Turn on PC
 - Hold (Option)

Boot Safe Mode
 - Turn on PC
 - Hold (Shift) Key

Full Screen Capture
Command + Shift + 3

Select Area Screen Capture
Command + Shift + 4 > Mouse Select Area

*** Command Key = Apple Key ***

BootCamp
What is BootCamp :
BootCamp is a function allow you install Microsoft Windows on your Mac with or without Mac OS.

License :
BootCamp is a tools to help you install the Microsoft Windows not include any Windows License, you should purchase Windows on online store or retail store.

What kind Windows allow to install on my Mac. If you need to purchase the Windows License, you should check which Windows OS allow install on your Mac.
https://support.apple.com/en-hk/HT204048

What should I need to prepare :
1. Your Mac : )
2. Internet Connection for download BootCamp file
3. Windows Source File Image (It require the ISO CD Image file, not CD)
4. 8GB USB Drive

Flow & Step (Official Guide link : http://www.apple.com/support/bootcamp/)
1. Plug the 8GB USB Drive, it should use FAT format
** if you got error on creating drive or you want to format to FAT, you can open Finder > Your Mac > Application > Utility > Disk Utility > Erase and choose FAT

2. Get ready the Windows ISO image file, if you only have CD, your should make a ISO image from CD.

3. Open Finder > Your Mac > Application > Utility > BootCamp
 -  You will see 3 checkbox :
 -  The first is create Windows Installation USB, this action will format your USB drive.
 -  Second is download BootCamp tools and software from internet to your USB, this action will not erase any file from USB,
 - The last is start the Bootcamp install or remove Microsoft Windows, you should use third options to install the Microsoft Windows. because direct boot from CDROM or USB your Mac keyboard and touch pad may not working, that mean you can't install the windows.

 - If you do it at first time, pleases check all box create Disk image to your USB, download driver and start the installation.

Remark : Don't use the BootCamp USB created by another Mac, it will got problem on installation such as keyboard mouse malfunction.

4. Start to install BootCamp will ask the size partition for Windows, if you just want Microsoft Windows on your Mac, please give it half half or any is ok, you can remove all partition on Windows Installation, then it will remains Windows OS only.

Q&A :
Q: After install how can i boot back MacOS
A: Turn On your Mac with hold "option" key, if will pop-up boot menu for you

Q: After bootcamp with dual OS, how can i remove Microsoft Windows, remain Mac.
A: On Mac bootcamp third option you can remove Windows

Q. After bootcamp with dual OS, how can i remove Mac remain Windows.
A. you can just simple remove the Mac OS partition on Windows, but combine the free space on windows you should try "Control Panel > Administrative Tools > Computer Management > Disk Management", i did not test, if can't combine the front free space to windows partition, you should find third party software to combine it.

Q. After bootcamp and only Windows only, how can i install Mac OS
A. You can use Internet Recovery to restore the Mac OS like new purchase status, but you can't add Mac OS on existing Windows.

2013年7月15日 星期一

CAT5e T568A/B, Crossover, Jack Modular and Faceplate

先來了解一下Network Cabling需要用的工具及物料

1. RJ45 鉗 (價錢約$150內, 可制作RJ45, RJ11, 開線及剪線, 試過係非油壓式的最好既一款)


2. Cutter 界刀, 用來開線用, 需然RJ45鉗9成都有開線刀, 但力度難以控制, 所以我地一般用Cutter
3. Injector 用來制作Jack Modular使用, 把線打入Jack Modular然後打走尾部份, 價錢由$40~$1000都有, 但我從來只會用Cutter做, Injector適合做Patch Panel, 做Jack Modular反而浪費時間及辛苦
4. 開線刀, 又係一支難以控制開線的工具, 價錢約$4-$8, 一般只會使用最左邊那個位用來代替Injector把線打入Jack Modular內
5. Cable Tester (約$40~$1000) 下面呢款是能手那些平民tester約$40, 用來測試LAN Cable的芯是否接妥




6. Faceplate / Wallplate 牆身面板, 插孔有1個, 2個及4個選擇 (價錢$8~$40)
7. Jack Modular 安裝在Faceplate上的價錢約($5~$40)
8. RJ45 (約$0.5 ~ $2) 不用解釋吧! 


如何制作CAT5e Lan Cable

 - 主要係Cable Pin 的接駁需要知道, 沒有什麼難度
 - 基本上制作所有LAN 線均是用T568B規格去制作, 一條LAN線只要兩邊的水晶頭均使用 T568A 或 T568B 便可以當作LAN 線使用 (即係一條Lan線, 頭尾水晶頭均使用同一規格, 便是LAN線)
 - 下圖 T568A 及 T568B 制作出來的線是相同沒分別的, 但係所有人均會用568B的制作方法, 這不是必需, 但這是規則, 因為假如手上有一條線我們需要重新制作一個水晶頭, 這樣便不需要考究這是568A還是568B, 直接做568B便可!! 這就是規則!!

 - Crossover 是供兩度電腦直接駁線是使用, LAN線一定是一邊行T568A另一邊行T568B, 這裏不作解釋因為不是教理論, 係教你點整條線
 - Youtube http://youtu.be/vFVSbcBJrxw
 - 下圖是T568B Lan 線, 可以看到兩個水晶頭最右邊是橙色芯


 - 參看下圖, 注意水晶頭 Pin1 是由左至右


Faceplate 及 Jack Modular 制作
 - 比水晶頭做RJ45更易, 跟顏色照做便可








2013年7月5日 星期五

IPSec VPN Tunnel 及各款Router的速度測試

測試環境 :
 - 主Office 使用Hong Kong Broadband BB100, 配合Pentium D, 2GB RAM, Gigabit LAN PC Base的 pfSense v2.03 Firewall!
















Netscreen 5gt
 - ISP : Hong Kong Broadband BB100
 - Internet Speed Upload 25MB, Download Speed 95MB
 - IPSec VPN Tunnel Upload/Download 平均約25-30MB速度 (download 2GB file 11mins內)















Zyxel NBG-460N Wireless Router with built-in 2 IPsec VPN tunnel 
 - ISP : Hong Kong Broadband BB100
 - Internet Speed Upload 27MB, Download Speed 94MB
 - IPSec VPN Tunnel Upload/Download 平均約5-11MB速度 (download 2GB file 45mins內)